access icon free Bidirectional wireless information and power transfer for decode-and-forward relay systems

© The Institution of Engineering and Technology
Received 25/10/2016, Accepted 13/07/2017, Revised 28/05/2017, Published 18/07/2017

In this study, the authors investigate the bidirectional wireless information and power transfer (BWIPT) in decode-and-forward (DF) relay systems, where the bidirectional relay can decode and forward information from the user to the access point (AP), and assist the wireless power transfer from the AP to the user. The relay employs the power splitting (PS) protocol to coordinate the received signal energy for information transmission and energy harvesting. By converting the multi-relay system information rate maximisation problem into a convex optimisation problem, the distributed power allocation scheme is obtained to maximise the information rate. Particularly, for single-relay systems, the authors derive the closed-form expression of the optimal PS factor, which can maximise the information rate. Simulation results show that the BWIPT for DF relay systems outperforms the BWIPT for amplify-and-forward relay systems.

Inspec keywords: radiofrequency power transmission; telecommunication power management; decode and forward communication; energy harvesting; inductive power transmission; protocols; relay networks (telecommunication); convex programming

Other keywords: distributed power allocation scheme; energy harvesting; closed-form expression; information transmission; single-relay systems; convex optimisation problem; BWIPT; access point; DF relay systems; optimal PS factor; bidirectional wireless information and power transfer; PS protocol; decode-and-forward relay systems; bidirectional relay; power splitting protocol; received signal energy; multirelay system information rate maximisation problem

Subjects: Telecommunication systems (energy utilisation); Optimisation techniques; Wireless power transmission; Protocols; Energy harvesting; Energy harvesting; Radio links and equipment

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